Sentry Supply 651-0454 One Way Barrel Nut, Number-10-24 x 5/8-Inch, Chrome,(Pack of 100) Used for tamper-resistant installations of commercial restroom partition hardware 10-24 thread, 5/8 inch shaft, 7/16 inch diameter head, 1/4 inch outside diameter of shaft, 3/4 inch overall length Chrome plated finish Constructed of steel 100 one-way barrel nut fasteners